Improvement in door-latches



J H CRA N E` Door-Latch. No. !62,275 PatemedAprisg0,\875,

WITNESSES INVENTB':

Q mi

/f/l j romans/ THE GRAPHIC C0.PHOT0'LITH.39&4! PARK PLAUEN-Y.

rron.

JONAS H. CRANE, OF SCHENECTADY, NEW YORK.

IMPROVEMENT IN DOOR-LATCHES.

Specification forming part of Letters Patent No. l 62,275, dated April 20, 1875; application led March 20, 1875.

To all whom it may concern: Y

Be it known that I, JONAS H. CRANE, of Schenectady, in the county of Schenectady and State of New York, have invented a new and Improved DoorLock, of which the following is a specification:

In the accompanying drawing, Figure l represent-s a side elevation of my improved doorlock; Fig. 2, an end view; and Fig. 3, a horizontal section of the same on the line 0 c, Fig. 1.

Similar letters of reference indicate corresponding parts.

My invention relates to a simple and readilyoperated door-lock, that is constructed without the use of springs and worked by a thumblever, so as to readily open and close the door.

The invention consists of a sliding bolt, which is operated by pivoted and horizontal toggle-levers, in connection with a thumb-1ever acting thereon.

In the drawing. A represents the sliding bolt, that is guided in suitable strips a at inside of the casing, set into the usual recess of the door. The toggle-levers B are pivoted at one end to bolt A, and at the other end to a stationary pin, b, of the casing, a pendent weight, C, being hung to the pivot-pin d of the toggle-levers B, imparting continually a downward strain on the levers, and keeping the bolt thrown to the outside of the casing. A thumb-lever, D, passes laterally through slots e of the casing and the surrounding door below the rear lever B, and rest-s, by a projection or lug, f, at the under side, in a grooved seat, D, applied tothe outer side of the door.

The seating of the thumb-lever secures the position of the bolt in forward direction, without being liable to be thrown back by mere pressure on the door. By raising the thumblever D the toggle-levers B are raised, and the bolt is thereby withdrawn, so that the door may be opened. rIhe release ot' the thumblever carries the toggle-levers, by the action ofthe weight, instantly in downward direction, and shoots the bolt forward for locking, forming thus a quickly-operated, effective, and very durable lock, without the use of any springs, to wear out and require repairs.

The lock may be readily changed from right to left hand by pulling out the pivot-pin of the bolt and turning the same in the casing.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A doorlock composed ot' a sliding bolt with pivoted and weighted toggle-levers and lateral operating thumb-lever, when arranged and constructed substantially as and for the purpose set forth. f'

2. The combination of' the lateral thumb-lever, swinging in guide-slots of the casiu g, and having the bottom projection, with the grooved outer seat part, substantially as speciiied.

JONAS H. CRANE. Witnesses:

E. RosA, D. A. ATWELL. 

